CNN is covering the latest from Asiana Airlines Flight 214's final moments in the air and the chaotic scene on the ground immediately after it crashed at San Francisco International Airport, killing two passengers.

Frightened witnesses and passengers on the plane made desperate calls for help moments after it crashed and burst into flames. This morning, we’re hearing their dramatic 911 calls.

“A chilling description of the traumatic scene as passengers escape the burning aircraft, and a desperate plea for emergency medical assistance,” Marquez explains.

The words on one call: "We've been down on the ground, I don't know, 20 minutes, a half-hour…There are people waiting on the tarmac with critical injuries, head injuries. We're almost losing a woman here…We're trying to keep her alive."